JP2011079142A - Seal structure of chamber-type ink supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent ink accumulation on a seal member in a seal structure of a chamber-type ink supply device. <P>SOLUTION: The seal structure of the chamber-type ink supply device includes a chamber body 3; a sealing blade 5; a doctor blade 6; the seal member 4 extended along the circumferential direction at either end of the surface of an anilox roll 7 to stick a back face 4a to the chamber body 3, to bring one end face 4b into close contact with the sealing blade 5, to bring the other end face 4c into close contact with the doctor blade 6 and to bring a top face 4d into sliding contact with the surface; a notch part 1a provided at the close contact part of the sealing blade 5 with each of both sealing members 4; and a liquid supply device 18 supplying liquid used for printing to a sliding contact part with the surface of the seal member 4 through the notch part 1a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seal structure of a chamber-type ink supply device that supplies ink to an anilox roll of a flexographic printing machine.

Some flexographic printing machines include a chamber-type ink supply device (see, for example, Patent Documents 1 and 2).
Here, first, an outline of a flexographic printing machine equipped with a chamber type ink supply device will be described.
FIG. 7 is a diagram illustrating a configuration of a main part of a flexographic printing machine including a chamber-type ink supply device. As shown in FIG. 7, the flexographic printing machine includes a chamber body 3, a seal member (side seal) 4 attached to the chamber body 3, and a seal blade 5 attached to the chamber body 3 via a rubber packing 9. And a back plate 15, a doctor blade 6 attached to the back plate 15, an anilox roll 7, a plate cylinder (rubber roll) 13, and an impression cylinder (hard roll, here, a Cr roll) 14.

The chamber 17 is formed by being surrounded by the chamber body 3, the seal blade 5, the doctor blade 6 and the seal member 4, and the cylindrical surface of the anilox roll 7. Note that the seal blade 5 and the doctor blade 6 are in sliding contact with the surface of the anilox roll 7 at their respective edges.
Ink is stored in the chamber 17 by an ink supply / discharge device (not shown), and the ink in the chamber 17 adheres to the surface of the rotating anilox roll 7, and the anilox roll 7. Excess ink is scraped off by the doctor blade 6 slidably in contact with the surface.

  Further, the ink adhering to the surface of the anilox roll 7 is scraped off by the doctor blade 6, and then the ink remaining in the cell of the anilox roll 7 is transferred to a convex surface corresponding to the printed pattern on the outer periphery of the rubber roll 13. The ink on the convex surface is transferred as an ink image to a printing medium (for example, the web 10 or the like) conveyed to the nip portion between the rubber roll 13 and the Cr roll 14.

  A predetermined pressure (air pressure) set in advance toward the anilox roll 7 is applied to the chamber body 3, and the pressure is applied to the seal blade 5 and the doctor blade 6 with respect to the anilox roll 7. An appropriate pressing force is applied. Even when the leading edges of the seal blade 5 and the doctor blade 6 are worn, the pressing force of the seal blade 5 and the doctor blade 6 against the anilox roll 7 is maintained while the chamber body 3 moves so as to approach the anilox roll 7. Is done.

  The seal member 4 has a back surface 4a fixed to the chamber body 3 so as to extend between the seal blade 5 and the doctor blade 6 (circumferential direction of the anilox roll 7), and both end surfaces 4b and 4c thereof are connected to the seal blade 5 and the doctor blade. Further, the top surface (the surface on the anilox roll 7 side) 4d is brought into sliding contact with the surface of the anilox roll 7 so as to prevent the ink inside the chamber 17 from leaking.

Such flexographic printing is an environmentally friendly printing method because it can use solvent-free UV ink and water-based ink, and therefore hardly pollutes the atmosphere in the printing process. In addition, compared to offset printing, in which a large amount of paper is wasted at the beginning of printing, flexographic printing has less paper waste because of the short time from the beginning of printing to color stability, and is excellent in terms of economy.
Furthermore, it excels at very thin and uniform solid printing, and can flexibly handle papers with poor smoothness (thick paper, cardboard, etc.), films, cloths and non-woven fabrics. Can exhibit high print reproducibility.

Because of these advantages, flexographic printing has been applied to various fields. Among them, flexographic printing is particularly suitable for a technique for improving the paper surface of newspaper printing paper.
That is, general newsprint paper has lower whiteness than general printing paper (office paper, books, etc.). For this reason, a technique has been proposed in which white ink is printed on a printing surface of a newsprint to improve the paper surface before characters are printed. Since newspaper printing is intended to perform a large amount of printing at a high speed, flexographic printing, which excels at very thin and uniform solid printing, is suitable.

Japanese Patent No. 2716457 Japanese Patent No. 3377466

By the way, the white ink (white anchor, hereinafter also referred to as WA ink) used for improving the paper surface by the flexographic printing method is sent to the downstream printing unit immediately after printing the WA ink on the paper surface, and the normal printing ( In other words, it is necessary to print images and characters), so that it is required to have excellent quick-drying properties.
Therefore, the inventors of the present application repeated a paper surface improvement test using a quick-drying aqueous WA ink. As a result, normal printing was performed immediately after the start of printing, and the WA ink printed on the paper was dry and normal printing could be performed without any problem, but as the printing time passed, the color of the pattern and characters It has been found that printing troubles such as hindrance to shape and shape occur.

As a result of investigating the cause, as shown in FIG. 8, WA ink gradually moves to a part of the top surface 4 d of the seal member 4 (on the inner side of the chamber and near the doctor blade 6, hereinafter referred to as an ink accumulation portion) 16. It turned out to be due to the accumulation.
That is, the top surface 4d of the seal member 4 is in close contact with the surface of the anilox roll 7, but the WA ink is located between the top surface 4d of the seal member 4 and the surface of the anilox roll 7 near the inside of the chamber of the top surface 4d. I will enter. For this reason, the seal member 4 has a certain width d, but the WA ink that has entered between the top surface 4 d of the seal member 4 and the surface of the anilox roll 7 is sheared from the anilox roll 7. Solidify by receiving power. Then, it is presumed that the WA ink progresses and accumulates on the side close to the doctor blade 6 that is the rotation direction of the anilox roll 7 while solidifying.

  As described above, a constant pressure is applied to the chamber, but when WA ink is solidified and deposited, the chamber is retracted by the thickness. The doctor blade that scrapes off the WA ink adhering to the anilox roll also moves back together with the chamber, so that a gap is generated between the doctor blade and the anilox roll, and the ink on the surface of the anilox roll by the doctor blade is generated. Scraping of the ink becomes insufficient, and the WA ink is thickly deposited on the anilox roll. And since the WA ink transferred to the printing surface of the web or the like becomes thicker as the WA ink is thickened, it is not completely dried, and the printing surface is sent to the downstream printing unit without being dried. Conceivable.

In this way, when the print surface is sent to a downstream printing unit while the printing surface is undried and the pattern or character is printed, the undried WA ink is mixed with the ink that prints the pattern or the character to cause turbidity. As a result, printing troubles such as hindrance to the color and shape of pictures and characters are caused.
Therefore, in preparation for such a situation, it is conceivable to set the pressure for pressing the chamber against the anilox roll in advance, but in this case, the wear of the edge of the doctor blade is further accelerated, and the doctor blade must be replaced. It must be done frequently and the maintenance burden increases.

Furthermore, since the seal member on which ink has accumulated must be removed or replaced with a new seal member, the operation must be interrupted each time, resulting in a decrease in work efficiency.
The phenomenon that the ink is solidified on the top surface of the seal member is considered to be caused by the quick drying property of the ink. In other words, quick-drying ink has the advantage that it dries quickly when printed on a web or the like. On the other hand, when it enters between the top surface of the seal member and the anilox roll, it solidifies by receiving a shearing force from the anilox roll. It is considered easy.

However, such a problem is not only when using a particularly fast-drying ink such as WA ink, but if the printing speed is increased, the shear force received from the anilox roll increases, and the ink is applied to the seal member. It is considered to be a problem that can occur in the same way because it is easy to solidify and accumulate.
The present invention has been devised in view of such a problem, and prevents ink from being deposited on the seal member and can optimize the pressing force of the doctor blade against the anilox roll. It is an object of the present invention to provide a sealing structure for an apparatus.

  In order to solve the above-mentioned problems, a seal structure of a chamber-type ink supply device according to claim 1 of the present invention includes a chamber main body for storing ink, a seal blade whose tip is in sliding contact with the surface of the anilox roll, and a tip A doctor blade that is in sliding contact with the surface, and extends in a circumferential direction at both ends of the surface, the back surface is fixed to the chamber body, one end surface is in close contact with the seal blade, and the other end surface is the doctor blade A seal member that is in close contact with the top surface and slidably contacts the surface, and a notch portion provided in a close contact portion of the seal blade with the seal members, and a portion of the notch portion near the outside of the chamber. The liquid used for printing is supplied to the seal portion that seals between the seal member and the sliding contact portion with the surface of the seal member through the notch. It is characterized by comprising a liquid supply device.

It is preferable that the notch portion is formed by removing the entire portion closer to the outside of the chamber among the portions of the seal blade that are in close contact with the one end surfaces of the seal members.
Or it is preferable that the said notch part removes the corner | angular part near the chamber outer side of the location closely_contact | adhered to the one end surface of the said both sealing members of the said sealing blade.
In the above case, it is preferable that a partition plate that functions as the seal portion in close contact with the outer end surface of the seal member is provided further to the outside of the chamber than the notch portion.

Alternatively, the notch is partially provided except for the outside of the chamber and the inside of the chamber in the portion of the seal blade that is in close contact with the one end surfaces of the seal members, and the notch is not provided. It is preferable that portions of the seal blade remaining on the outside of the chamber and the inside of the chamber function as the seal portion.
In addition, the above “outside of the chamber” means “close to the outside of the chamber in the axial direction of the anilox roll”, and “close to the inside of the chamber” means “close to the inside of the chamber in the axial direction of the anilox roll”. To do.

Furthermore, it is preferable that at least the top surface near the inside of the chamber on the other end surface side of each seal member is provided with a notch portion that is partially cut away.
Further, it is preferable that a sealant is filled between each of the seal members and the seal blade.

  According to the seal structure of the chamber type ink supply device of the present invention, the liquid supplied to the seal member through the notch enters the slidable contact portion between the top surface of the seal member and the surface of the anilox roll, and the surface and the slidable surface. Since the ink reaches the top surface of the sealing member in contact with the sealing member, ink is prevented from solidifying and depositing on the top surface of the sealing member. This prevents the chamber body from moving backward due to the solidification of the ink on the top surface of the seal member, and the doctor blade can be kept in a state where it is in sliding contact with the anilox roll properly. Occurrence of printing failure can be prevented.

For this reason, it is not necessary to set the pressing force of the chamber in advance strongly, and the pressing force of the doctor blade against the anilox roll can be optimized. Replacement frequency can be reduced, and the maintenance burden is reduced.
In addition, the seal part prevents ink leakage and the cutout part prevents ink accumulation, so it is not necessary to interrupt work frequently for replacement of seal members, etc., enabling long-term operation. Become.

In addition, by providing a notch (notch on the seal member side) in advance on the top surface of the seal member where ink is likely to accumulate, ink accumulation on the top surface of the seal member can be more reliably prevented. can do.
Furthermore, ink leakage can be reliably prevented by filling a sealant between each seal member and the seal blade.

It is a typical perspective view for demonstrating the principal part of the seal structure of the chamber type ink supply apparatus concerning 1st Embodiment of this invention. It is a typical perspective view which shows the principal part of the seal structure of the chamber type ink supply apparatus concerning 1st Embodiment of this invention except an anilox roll. It is a typical perspective view which shows the principal part of the seal structure of the chamber type ink supply apparatus concerning 1st Embodiment of this invention except an anilox roll. It is a typical perspective view for demonstrating the principal part of the seal structure of the chamber type ink supply apparatus concerning 2nd Embodiment of this invention. FIG. 5A is a schematic view showing the main part of a seal structure of a chamber-type ink supply device according to a second embodiment of the present invention, excluding an anilox roll, FIG. 5A is a perspective view thereof, and FIG. It is a front view. It is a typical perspective view which shows the principal part of the seal structure of the chamber type ink supply apparatus concerning 3rd Embodiment of this invention except an anilox roll. It is a typical perspective view which shows the principal part structure of the flexographic printing machine provided with the general chamber type ink supply apparatus. It is a typical perspective view for demonstrating the accumulation of the ink in the seal structure of the conventional chamber type ink supply apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, the same members and the like as those in the prior art will be described with the same reference numerals as those in the conventional explanation.
[First Embodiment]
The seal structure of the chamber-type ink supply apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic diagram for explaining the main part of the seal structure of the chamber-type ink supply apparatus. FIG. 2 and FIG. 3 are schematic perspective views showing the main part of the seal structure of the chamber type ink supply device, excluding the anilox roll. In each figure, the thickness of the chamber body 3, the sealing blade 5, the doctor blade 6, the sealing agent 8, the rubber packing 9, and the back plate 15 is shown to be thicker than actual for easy understanding. Moreover, in each figure, it has shown in figure except the partition plate 11 for convenience, and the partition plate 11 is shown with the dashed-two dotted line.

Note that FIG. 7 is used for an outline description of the flexographic printing machine.
Also, in the present embodiment, an example is described in which flexographic printing is applied to print white ink (WA ink) on the printing surface in order to improve the printing surface of the newsprint, that is, to improve whiteness. To do. Moreover, it demonstrates as what uses water-based WA ink for WA ink. However, the ink is not limited to water-based WA ink, and the liquid may be ink solvent or water.

  As shown in FIG. 7, the flexographic printing machine according to the present embodiment includes a chamber body 3, a seal member (side seal) 4 attached to the chamber body 3, and a rubber packing 9, as in a conventional flexographic printing machine. The seal blade 5 and the back plate 15 attached to the chamber body 3 through the doctor blade 6 attached to the back plate 15, the anilox roll 7, the plate cylinder (rubber roll) 13, the impression cylinder (hard roll, here Then, a Cr roll) 14 is provided. Further, as shown in FIG. 1, the flexographic printing machine according to the present embodiment includes a cutout portion 1a and a seal portion 2a provided in the seal blade 5, a sealant 8, a partition plate 11, and a seal member side cutout. A portion (side seal side notch) 12 and a nozzle (liquid supply device) 18 are provided.

The chamber 17 is formed by being surrounded by the chamber body 3, the seal blade 5, the doctor blade 6 and the side seal 4, and the cylindrical surface of the anilox roll 7. Note that the seal blade 5 and the doctor blade 6 are in sliding contact with the surface of the anilox roll 7 at their respective edges.
Here, the seal blade 5 may be made of resin or metal as long as it can be sealed to prevent ink leakage from the inside of the chamber 17. The anilox roll 7 can absorb the straightness of the side in contact with the surface of the anilox roll 7 and the swell when the seal blade 5 is fixed, and has an appropriate rigidity that does not scrape unused return ink. Any material can be used as long as it can be touched lightly.

  Further, the doctor blade 6 has a high straightness of the edge of the tip contacting the anilox roll 7 (closer to a straight line), a high flatness of a surface in the vicinity of the tip edge (closer to a flat surface), and an excessive amount. It does not deform and has an appropriate rigidity that can absorb the swell when the doctor blade 6 is fixed, and fits the entire surface of the anilox roll 7, that is, the edge of the tip of the doctor blade 6 when the anilox roll 7 rotates. Is preferably in contact with the surface of the anilox roll 7 at all times. Furthermore, it is preferable that the doctor blade 6 has as high an abrasion resistance as possible within a range in which the surface of the anilox roll 7 is not worn. For example, as an example of a suitable doctor blade 6, there is a ceramic sprayed one in the vicinity of the edge portion of the tip of stainless steel (SUS), but the invention is not limited to this, and various modifications can be made as long as the above requirements are satisfied. Is possible.

  The side seal 4 has a back surface 4a fixed to the chamber body 3 so as to extend between the seal blade 5 and the doctor blade 6 (circumferential direction of the anilox roll 7), and both end surfaces 4b and 4c thereof are connected to the seal blade 5 and the doctor blade. Further, the top surface (the surface on the anilox roll 7 side) 4d is brought into sliding contact with the surface of the anilox roll 7 so as to prevent the ink inside the chamber 17 from leaking.

  Further, the side seal 4 has a moderate rigidity that does not cause deformation due to the rotation of the anilox roll 7 and does not cause anxiety such as heat due to an increase in friction accompanying an increase in the seal surface pressure. preferable. For example, as an example of a suitable side seal 4, there is a silicon-based single foamed rubber.

The sealant 8 is filled in the gap (the black portion shown in FIG. 1) between the side seal 4, the seal blade 5, the doctor blade 6, and the back plate 15, and reliably prevents ink leakage. The sealant 8 has an adhesive force and a slight elasticity, and preferably has an effect of reliably filling the gap between the seal blade 5, the doctor blade 6 and the back plate 15 and the side seal 4.
The rubber packing 9 is provided between the chamber body 3 and the seal blade 5 and the back plate 15 and seals the ink inside the chamber 17 so as not to leak.
The back plate 15 is provided on the back surface of the doctor blade 6 in order to prevent excessive deformation of the doctor blade 6.

  Here, as a characteristic structure, the seal blade 5 has a cutting formed by deleting the entire portion close to the outside of the chamber in close contact with the side seal 4 or shortening the length of the seal blade 5. A notch portion 1a is provided. Further, the seal portion 2a, which is the back surface of the seal blade 5 that is in contact with the side seal 4 and closer to the inside of the notch portion 1a in the chamber, is the remaining surface of the seal blade 5 in which the notch portion 1a is formed. It is provided to seal between the blade 5 and the side seal 4 and prevent ink leakage in the chamber 17. Further, a nozzle (liquid supply device) 18 for supplying water (ink solvent) to the top surface 4d of the side seal 4 through the notch 1a is provided above the notch 1a.

Here, “close to the outside of the chamber” means “close to the outside of the chamber in the axial direction of the anilox roll 7”, and “close to the inside of the chamber” means “close to the inside of the chamber in the axial direction of the anilox roll 7”. "Means.
Further, since the cutout portion 1a is provided on the entire outside of the chamber of the seal blade 5, the partition plate 11 functioning as a seal portion is provided as shown by a two-dot chain line in FIG. That is, the partition plate 11 is in close contact with the outer end surface of the side seal 4 on the outer side of the notch 1a and further toward the outside of the chamber, so that water as an ink solvent supplied from the nozzle 18 can be surely leaked to the outside. Can be prevented. Here, the partition plate 11 should just have a function as a seal part which can prevent the water supplied from the nozzle 18 from leaking directly outside, and is not limited to the shape shown in FIG.

  It is also possible not to provide the partition plate 11. Since the partition plate 11 needs to be attached with high precision in consideration of the positional relationship between the side seal 4 and the anilox roll 7, it takes time to adjust the attachment position. However, even if the partition plate 11 is not provided, the ink supplied from the nozzles Since the water as the solvent is basically sucked into the side seal 4, it is possible to save the trouble of attaching the partition plate 11 when the partition plate 11 is not provided.

  As shown in FIGS. 2 and 3, the side seal side cutout portions 12, 12 are formed by partially cutting out only this portion inside the chamber of the top surface 4 d of the side seal 4 and close to the doctor blade 6. 'Is provided. In addition, as shown in FIG. 2, the shape of the side seal side notch 12 provided from the top surface 4d to the back surface 4a on the inner side of the chamber of the side seal 4 and near the doctor blade 6 may be used. As shown in FIG. 3, the shape of the side seal-side notch 12 'provided partially inside the chamber of the side seal 4 and only on the top surface 4d side near the doctor blade 6 may be used (the back surface 4a side is notched). Absent).

  Since the seal structure of the chamber-type ink supply device according to the first embodiment of the present invention is configured as described above, during printing, water as an ink solvent passes from the nozzle 18 to the notch 1a. It is dripped continuously. This water is supplied to the one end surface 4b of the side seal 4 through the notch 1a. The supplied water enters the sliding contact portion between the top surface 4 d of the side seal 4 and the surface of the anilox roll 7 by the rotation of the anilox roll 7 and spreads below the top surface 4 d of the side seal 4. Go around. For this reason, even if the ink that has entered the top surface 4d of the side seal 4 receives a shearing force from the surface of the anilox roll 7, it is not solidified by water as the supplied ink solvent, and the top surface of the side seal 4 It is prevented that the solidified ink is accumulated in 4d.

Accordingly, the chamber main body 3 is prevented from retreating due to the solidification of the ink on the top surface 4d of the side seal 4, and the doctor blade 6 can be kept in a state in which the doctor blade 6 is in sliding contact with the anilox roll 7 appropriately. Then, it is possible to prevent the occurrence of a printing failure due to poor scraping of the doctor blade 6.
For this reason, it is not necessary to set the pressing force of the chamber 17 strongly in advance, and the pressing force of the doctor blade 6 against the anilox roll 7 can be optimized, so that wear at the edge of the doctor blade 6 is suppressed. Thus, the replacement frequency of the doctor blade 6 can be suppressed, and the maintenance burden is reduced.

Further, the partition plate 11 as the seal portion reliably prevents the water supplied as the ink solvent from directly leaking outside, and the seal portion 2a has a function of preventing leakage of WA ink inside the chamber 17, so that the notch portion It is possible to securely seal between the seal blade 5 and the side seal 4 on the outer side and the inner side of the chamber 1a.
However, the seal | sticker part 2a should just have these functions, and is not restricted to the thing of this embodiment.

Therefore, in order to prevent ink leakage or the like by the partition plate 11 and the seal portion 2a and to prevent ink accumulation by the notch portion 1a, it is not necessary to frequently interrupt the work for replacement of the side seal 4 or the like. Long time operation is possible.
Further, since the side seal-side notch portion 12 is provided in advance in the portion 16 where the ink on the top surface 4d of the side seal 4 is liable to be deposited, the ink is more reliably deposited on the top surface 4d of the side seal 4. Can be prevented.

Furthermore, since the sealant 8 is filled between each side seal 4 and the seal blade 5 and doctor blade 6, ink leakage can be reliably prevented.
In the present embodiment, the notch 1a is provided by deleting the entire portion of the seal blade 5 near the outside of the chamber or by shortening the length of the seal blade 5, so that the notch 1a is processed. Can be easily applied.

[Second Embodiment]
Next, the seal structure of the chamber type ink supply apparatus according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a view for explaining the main part of the seal structure of the chamber type ink supply apparatus. FIG. 5 is a schematic view showing the main part of the seal structure of the chamber-type ink supply device, excluding the anilox roll, FIG. 5 (a) is a perspective view thereof, and FIG. 5 (b) is a perspective view thereof. It is the front view. The same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant descriptions are omitted.

As shown in FIGS. 4 and 5, the flexographic printing machine according to the present embodiment is different from the first embodiment in that the cutout portion 1 b is formed by cutting out a part of contact with the side seal 4. Yes. In addition, the seal portion which is the back surface of the seal blade 5 which is in contact with the side seal 4 on the inner side and the outer side of the notch portion 1b and which is the remaining surface of the seal blade 5 where the notch portion 1b is formed. 2 a and 2 b are provided to seal between the seal blade 5 and the side seal 4 and prevent ink leakage in the chamber 17.
The structure other than the above is the same as that of the first embodiment.

  Since the seal structure of the chamber-type ink supply device according to the second embodiment of the present invention is configured as described above, during printing, water as an ink solvent is used as the nozzle 18 during printing, as in the first embodiment. Is continuously dropped onto the cutout portion 1b. This water is supplied to the one end face 4b of the side seal 4 through the notch 1b. The supplied water enters the sliding contact portion between the top surface 4 d of the side seal 4 and the surface of the anilox roll 7 by the rotation of the anilox roll 7 and spreads below the top surface 4 d of the side seal 4. Go around. For this reason, even if the ink that has entered the top surface 4d of the side seal 4 receives a shearing force from the surface of the anilox roll 7, it is not solidified by water as the supplied ink solvent, and the top surface of the side seal 4 It is prevented that the solidified ink is accumulated in 4d.

Accordingly, the chamber main body 3 is prevented from retreating due to the solidification of the ink on the top surface 4d of the side seal 4, and the doctor blade 6 can be kept in a state in which the doctor blade 6 is in sliding contact with the anilox roll 7 appropriately. Then, it is possible to prevent the occurrence of a printing failure due to poor scraping of the doctor blade 6.
For this reason, it is not necessary to set the pressing force of the chamber 17 strongly in advance, and the pressing force of the doctor blade 6 against the anilox roll 7 can be optimized, so that wear at the edge of the doctor blade 6 is suppressed. Thus, the replacement frequency of the doctor blade 6 can be suppressed, and the maintenance burden is reduced.

Further, the seal portion 2b prevents water supplied as an ink solvent from directly leaking to the outside, and the seal portion 2a has a function of preventing leakage of WA ink inside the chamber 17, so that the notch portion 1b near the inside of the chamber and It is possible to reliably seal between the seal blade 5 and the side seal 4 on the outer side.
However, the seal portions 2a and 2b are not limited to those of the present embodiment as long as they have these functions.

Therefore, since the seal portions 2a and 2b prevent ink leakage and the notch portion 1b prevents ink accumulation, the work need not be frequently interrupted for replacement of the side seal 4 and the like. Can be operated.
Further, since the side seal-side notch portion 12 is provided in advance in the portion 16 where the ink on the top surface 4d of the side seal 4 is liable to be deposited, the ink is more reliably deposited on the top surface 4d of the side seal 4. Can be prevented.

Furthermore, since the sealant 8 is filled between each side seal 4 and the seal blade 5 and doctor blade 6, ink leakage can be reliably prevented.
In the present embodiment, there is an advantage that it is not necessary to provide the partition plate 11 in order to prevent the seal portion 2b from leaking water supplied as an ink solvent directly to the outside.

[Third Embodiment]
Next, the seal structure of the chamber-type ink supply device according to the third embodiment of the present invention will be described with reference to FIG. 6. FIG. 6 shows the main part of the seal structure of the chamber-type ink supply device, excluding the anilox roll. It is a typical perspective view. Note that the same members and the like as those in the first and second embodiments are denoted by the same reference numerals as those in the first and second embodiments, and redundant descriptions are omitted.
Further, the third embodiment is different from the first embodiment only in the way of providing the notch 1a, and the other structure is the same as that of the first embodiment.

  As shown in FIG. 6, in the flexographic printing machine according to the present embodiment, the cutout portion 1 c deletes the corner of the seal blade 5 that is closer to the outside of the chamber (outside of the chamber and closer to the tip of the seal blade 5). Is provided. Further, the seal portion 2a, which is the back surface of the seal blade 5 that is in contact with the side seal 4 and closer to the inside of the notch portion 1c in the chamber, is the remaining surface of the seal blade 5 in which the notch portion 1c is formed. It is provided to seal between the blade 5 and the side seal 4 and prevent ink leakage in the chamber 17.

  Further, since the notch portion 1c is provided at the corner of the seal blade 5 near the outside of the chamber, the partition plate 11 functioning as a seal portion in this embodiment is also shown in FIG. It is provided as shown by a two-dot chain line. The partition plate 11 is in close contact with the outer end surface of the side seal 4 further toward the outside of the chamber than the notch 1c, and reliably prevents water as an ink solvent supplied from the nozzle 18 from leaking directly to the outside. be able to. Here, the partition plate 11 should just have a function as a seal part which can prevent the water supplied from the nozzle 18 from leaking directly outside, and is not limited to the shape shown in FIG.

  Moreover, it is also possible not to provide the partition plate 11 similarly to 1st Embodiment. In this case, the trouble of attaching the partition plate 11 can be saved. Since the seal structure of the chamber-type ink supply device according to the third embodiment of the present invention is configured as described above, water as an ink solvent is used during printing as in the first and second embodiments. Is continuously dropped from the nozzle 18 to the cutout portion 1c. This water is supplied to the one end surface 4b of the side seal 4 through the notch 1c. The supplied water enters the sliding contact portion between the top surface 4 d of the side seal 4 and the surface of the anilox roll 7 by the rotation of the anilox roll 7 and spreads below the top surface 4 d of the side seal 4. Go around. For this reason, even if the ink that has entered the top surface 4d of the side seal 4 receives a shearing force from the surface of the anilox roll 7, it is not solidified by water as the supplied ink solvent, and the top surface of the side seal 4 It is prevented that the solidified ink is accumulated in 4d.

Accordingly, the chamber main body 3 is prevented from retreating due to the solidification of the ink on the top surface 4d of the side seal 4, and the doctor blade 6 can be kept in a state in which the doctor blade 6 is in sliding contact with the anilox roll 7 appropriately. Then, it is possible to prevent the occurrence of a printing failure due to poor scraping of the doctor blade 6.
For this reason, it is not necessary to set the pressing force of the chamber 17 strongly in advance, and the pressing force of the doctor blade 6 against the anilox roll 7 can be optimized, so that wear at the edge of the doctor blade 6 is suppressed. Thus, the replacement frequency of the doctor blade 6 can be suppressed, and the maintenance burden is reduced.

Further, since the partition plate 11 functions as a seal portion, water supplied as an ink solvent is prevented from directly leaking outside, and the seal portion 2a has a function of preventing leakage of WA ink inside the chamber 17, and thus is notched. It is possible to reliably seal between the seal blade 5 and the side seal 4 near the inside of the chamber of the portion 1c.
Therefore, in order to prevent ink leakage and the like by the partition plate 11 and the seal portion 2a as the seal portion and to prevent ink accumulation by the notch portion 1c, the operation is frequently interrupted for replacement of the seal member 4 or the like. It does not have to be, and a long time operation is possible.

Further, since the side seal-side notch portion 12 is provided in advance in the portion 16 where the ink on the top surface 4d of the side seal 4 is liable to be deposited, the ink is more reliably deposited on the top surface 4d of the side seal 4. Can be prevented.
Furthermore, since the sealant 8 is filled between each side seal 4 and the seal blade 5 and doctor blade 6, ink leakage can be reliably prevented.

In the present embodiment, the cutout portion 1c is provided by deleting the corner portion of the seal blade 5, so that the cutout portion 1c can be easily processed.
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, although the ink is water-based in the above embodiment, it may be oil-based. Moreover, the side seal side notch part 12 does not need to be provided.

  The present invention can be widely applied to the printing industry using a printing press equipped with a chamber-type ink supply device.

1a, 1b, 1c Notch portion 2a, 2b Seal portion 3 Chamber body 4 Seal member (side seal)
4a Back surface of seal member 4b One end surface of seal member 4c Other end surface of seal member 4d Top surface of seal member 5 Seal blade 6 Doctor blade 7 Anilox roll 8 Sealing agent 9 Rubber packing 10 Web 11 Partition plate 12, 12 'Seal member side Notch (Side seal side notch)
13 Rubber roll 14 Impression cylinder (hard roll, Cr roll)
15 Back Plate 16 Ink Accumulation Unit 17 Chamber 18 Nozzle (Liquid Supply Device)

Claims (7)

A chamber body for storing ink; a seal blade whose tip is in sliding contact with the surface of the anilox roll; a doctor blade whose tip is in sliding contact with the surface; and a back surface extending in the circumferential direction at both ends of the surface. A seal member fixed to the chamber body, having one end surface in close contact with the seal blade, the other end surface in close contact with the doctor blade, and a top surface slidably contacting the surface. Structure,
A notch provided in a close contact area between the seal blade and the seal members;
A seal portion that seals between the notch portion and the seal member on the outside of the chamber;
A seal structure for a chamber-type ink supply device, comprising: a liquid supply device that supplies a liquid used for printing to a sliding contact portion with the surface of the seal member through the notch. 2. The chamber-type ink supply device according to claim 1, wherein the notch portion is formed by removing an entire portion near the outer side of the chamber from a portion of the seal blade that is in close contact with one end surfaces of the two seal members. Seal structure. 2. The chamber-type ink according to claim 1, wherein the notch is formed by removing a corner near the outside of the chamber from a portion of the seal blade that is in close contact with one end surfaces of the two seal members. Supply device seal structure. 4. The chamber-type ink according to claim 2, wherein a partition plate that is in close contact with the outer end surface of the seal member and functions as the seal portion is provided further to the outside of the chamber than the notch portion. Supply device seal structure. The notch is partially provided except for the outside of the chamber and the inside of the chamber of the seal blade that is in close contact with the one end surfaces of the seal members, and remains without the notch being provided. The seal structure of the chamber-type ink supply device according to claim 1, wherein a portion of the seal blade closer to the outside of the chamber and a portion closer to the inside of the chamber function as the seal portion. 6. The seal member-side notch portion in which at least the top surface near the inside of the chamber on the other end surface side of each of the seal members is provided with a notch portion that is partially cut out. A seal structure for a chamber-type ink supply device according to claim 1. The seal structure for a chamber-type ink supply device according to any one of claims 1 to 6, wherein a sealant is filled between each of the seal members and the seal blade.

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